Catalyst for dehydrogenation of light alkane and preparation method of catalyst

A technology of low-carbon alkanes and catalysts, which is applied in the field of catalysts and preparations for the dehydrogenation of low-carbon alkanes, and can solve the problems of catalyst stability and selectivity are not very good, performance is not very ideal, etc.

Inactive Publication Date: 2013-11-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the harsh conditions of high temperature and hydrogen, the performance of existing platinum-based catalysts is not very ideal, such as catalyst stability and selectivity are not very good; al

Method used

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  • Catalyst for dehydrogenation of light alkane and preparation method of catalyst
  • Catalyst for dehydrogenation of light alkane and preparation method of catalyst
  • Catalyst for dehydrogenation of light alkane and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the laboratory, a fixed-bed reactor is used with an inner diameter of 20mm and a length of 50cm. The reactor is wrapped with an open electric heating furnace, which can continuously supply the heat required for the reaction. The raw material composition is shown in Table 1, which contains 85.11% (weight) of isobutane and 12.69% (weight) of n-butane. The reaction temperature is 600°C, and the space velocity of low-carbon alkanes is 1000h -1 , the volume ratio of hydrogen and raw materials is 0.5:1, the two are mixed into the top of the reactor after metering, the reactor is equipped with a catalyst, the catalyst is a self-made noble metal catalyst with platinum as the active component, and the catalyst contains platinum 0.35 %, tin 0.5%, take a sample after reacting for 1 hour, analyze the product composition with a gas chromatograph, remove the hydrogen content, and the product composition is shown in Table 2.

[0019] Table 1

[0020]

[0021] Table 2

[002...

Embodiment 2

[0030] Reactor and reaction conditions as embodiment 1, reaction raw material is isobutane, purity 99.94%, adopt Pt-Sn catalyzer and Pt-Sn-Ce-La-K catalyzer, contain platinum 0.35% in the catalyzer, tin 0.7%, K0.2% (weight), Ce0.25% (weight), La0.27% (weight), the composition of the reaction product is shown in Table 5.

[0031] table 5

[0032]

[0033] It can be seen from Table 5 that for high-purity isobutane raw materials, the selectivity and conversion rate of the catalyst are greatly improved after the Pt-Sn-Ce-La-K catalyst is used. By changing the ratio of La and K, it is found that under the condition that K accounts for 0.1-0.5% (weight) of the carrier and La accounts for 0.01-1.0% (weight) of the carrier, the selectivity and conversion rate of the catalyst can be effectively improved.

Embodiment 3

[0035] Using the same reactor and catalyst as in Example 1, the reaction temperature is controlled at 610 ° C, and other conditions are the same as in Example 2, using propane feed, propane purity 99.9%, propane normal pressure space velocity is 1000h -1 , The volume ratio of propane to hydrogen is 1:0.5, and the results are shown in Table 6 after 4 hours of reaction.

[0036] Table 6

[0037]

[0038] It can be seen from Table 6 that the dehydrogenation effect of propane using Pt-Sn-Ce-La-K catalyst is better than that of Pt-Sn catalyst currently in use in the world, and the conversion rate and selectivity are higher.

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Abstract

The invention belongs to the field of petroleum refining and chemical engineering, and relates to a catalyst for dehydrogenation of light alkane and a preparation method of the catalyst. The light alkane can be dehydrogenated to produce corresponding light olefin, aluminum oxide is used as a carrier of the catalyst, active components are platinum and tin, and auxiliary active components are potassium, cerium and lanthanum. Platinum accounts for 0.2-0.6wt% of the carrier, tin accounts for 0.3-1wt% of the carrier, potassium accounts for 0.05-0.5wt% of the carrier, cerium accounts for 0.05-1.0wt% of the carrier, and lanthanum accounts for 0.01-1.0wt% of the carrier. When the catalyst is used, the carbon deposit of the catalyst can be reduced, the catalyst selectivity and conversion rate of the catalyst are improved, and the service life and activity cycle of the catalyst are prolonged.

Description

technical field [0001] The invention belongs to the fields of petroleum refining and chemical industry, and relates to a catalyst for dehydrogenating low-carbon alkanes and a preparation method thereof. The International Patent Classification belongs to C10G. Background technique [0002] Low-carbon alkanes include propane, isobutane, and isopentane, etc., which are produced in petroleum refining processes and associated gas in oil fields, and have low value and narrow uses. However, low-carbon olefins such as propylene, isobutylene, and isopentene have many uses in the chemical industry and are of high value. The dehydrogenation of propane, isobutane, isopentane, etc. to produce the corresponding olefins is of great significance. Therefore, there are many studies in this area. [0003] There are mainly two types of catalysts used in the catalytic dehydrogenation of low-carbon alkanes at home and abroad: platinum-based catalysts and chromium-based catalysts. Chromium-bas...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J32/00C07C11/09C07C5/333
Inventor 王延臻徐鸿宋春敏段红玲李金云王丽娟何平王鹏成高丽陈小艳杨利强田帅孟杨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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